Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d972a0f462cf434…

MALICIOUS

PDF

42.4 KB Created: 2020-09-01 02:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efb954d486ddea91da1a0fecce8a263e SHA-1: 4746cdc7ac63221b6a9bb80dbfec169e4bfefd6e SHA-256: 6d972a0f462cf43494d0ce4edf5e595628f584e2975846afd295774cede2dd55
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains embedded URLs that lead to a redirector service, which in turn points to a link farm of other PDFs. The document body, though heavily obfuscated, contains text related to 'performance parts for japanese cars' and the malicious URL. The ML classifier and redirector heuristics strongly indicate malicious intent, likely to drive traffic to malicious sites or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.club/wix?keyword=performance+parts+for+japanese+cars
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/c3f59f_0927947afced44dc900163fc98f0b934.pdf
    • https://static.usrfiles.com/ugd/b8c837_da33659d42c143039cdf1ef802bab706.pdf
    • https://static.usrfiles.com/ugd/b8c837_dadf793f1f094f208f6c03aaa8983bea.pdf
    • https://static.usrfiles.com/ugd/a640e9_1aaaa86985f0450abe51f3f7035571c8.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3adabb3da63441b94fc10baf91845ec.pdf
    • https://static.usrfiles.com/ugd/5ecadc_39702b45784149cd9956e1175ad55a56.pdf
    • https://static.usrfiles.com/ugd/b8c837_00fd662ccaa04630affd15a124454021.pdf
    • https://cdn.shopify.com/s/files/1/0437/5409/4753/files/business_management_full_notes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/fekupawidalusunobezojiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/7113/4106/files/yanmar_3_cylinder_diesel_engine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/7474/0639/files/24673290207.pdf
    • https://cdn.shopify.com/s/files/1/0429/2768/5788/files/20333490938.pdf
    • https://cdn.shopify.com/s/files/1/0431/6623/6834/files/today_eenadu_news_epaper_andhra_pradesh.pdf
    • https://cdn.shopify.com/s/files/1/0438/5033/4368/files/rasubemawexitivovan.pdf
    • https://cdn.shopify.com/s/files/1/0439/1141/3915/files/nuxuxavitisug.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vabagibad.pdf
    • https://cdn.shopify.com/s/files/1/0435/9369/5391/files/prentice_hall_african_american_history.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000651a.bin
fe777e8681168f795ffa3f1b67b228093289ba6d0d15c69c5ca258a0511e7aa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x651A 5208 bytes
font_01_sfnt_off000076ba.bin
831590b62dfbba5d10eda900fb2a111e49d0038f3a4e1ca1758eb6492285d047		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76BA 11620 bytes

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